Remove duplicated T2 must-gather tests covered by upstream T1

[OhadRevah]

What this PR does / why we need it:

Remove T2 tests that are already validated by stricter upstream T1 tests in kubevirt/must-gather (using reflect.DeepEqual on full spec):

• CNV-3042 (NetworkAddonsConfig)
• CNV-3373 (CDIConfig)
• CNV-3043 (VirtualMachine)

Remove CNV-2983 (kubemacpool-leader pod) as it's covered by CNV-8880 which selects all kubemacpool pods including the leader.

Consolidate CNV-2939 (ImageStreamTag count + content validation) into CNV-9236 in test_must_gather_images.py.

Add pytest.mark.dependency between test_no_new_cnv_crds (CNV-8508) and test_crd_resources (CNV-2724) to skip CRD validation when unknown CRDs are detected.

Upstream T1 proof (validate_must_gather_test.go):

• L107: CDIConfig cluster-scoped resource validation
• L109: NetworkAddonsConfig cluster-scoped resource validation
• L133-135: reflect.DeepEqual on full spec for both
• L239-257: VirtualMachine DescribeTable validation
• L267-283: validateVmFile with reflect.DeepEqual on full VM spec https://github.com/kubevirt/must-gather/blob/92d6483f/tests/validate_must_gather_test.go

assisted by: claude code claude-opus-4-6

Which issue(s) this PR fixes:

Special notes for reviewer:

jira-ticket:

https://redhat.atlassian.net/browse/CNV-35404

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Reviewing files that changed from the base of the PR and between 93d8ab2 and ff7878e.

📒 Files selected for processing (3)

• tests/install_upgrade_operators/must_gather/test_must_gather.py
• tests/install_upgrade_operators/must_gather/test_must_gather_images.py
• tests/install_upgrade_operators/must_gather/test_must_gather_vms.py

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